| dbo:abstract |
BZ Ursae Majoris is a dwarf nova star system in the northern circumpolar constellation of Ursa Major. It consists of a white dwarf primary in a close orbit with a red dwarf. The latter star is donating mass, which is accumulating in an accretion disk orbiting the white dwarf. The system is located at a distance of approximately 505 light years from the Sun based on parallax measurements. This system was discovered to vary in brightness by B. E. Markaryan in 1968, and it was given the variable star designation BZ UMa. After four years of observation by the AAVSO, it was proposed to be a cataclysmic variable by M. Mayall. In 1982, R. F. Green and associates identified it as a cataclysmic variable candidate of the U Gem-type, based on its spectrum. The same year, W. Wenzel showed that this star had very long intervals between outbursts, placing it intermediate between the U Gem and WZ Sge classes. P. Szkody and examined the infrared light curve of the system, estimating an orbital inclination of 60° with no evidence of heating from the white dwarf. and associates in 1990 found a periodic modulation of hydrogen emission lines, indicating an orbital period of 1.62 h. They suggested it be classified as a SU UMa star. Spectroscopic examination of the system using the Hubble Space Telescope during 2001 showed an anomalous abundance ratio of nitrogen to carbon that indicates CNO-processing. This may be the result of an earlier evolutionary stage of the donor star that was stripped of its outer layers. A superoutburst was observed in 2007 that displayed superhumps. A lack of circular polarization indicates the white dwarf is not strongly magnetic, and thus this system is most likely not a intermediate polar. (en) BZ Большой Медведицы (лат. BZ Ursae Majoris) — карликовая новая, двойная катаклизмическая переменная звезда типа U Близнецов (UG) в созвездии Большой Медведицы на расстоянии приблизительно 497 световых лет (около 153 парсеков) от Солнца. Видимая звёздная величина звезды — от +15,3m до +10,5m. (ru) |
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wiki-commons:Special:FilePath/BZUMaLightCurve.png?width=300 |
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17050 (xsd:nonNegativeInteger) |
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dbr:American_Association_of_Variable_Star_Observers dbr:Benjamin_Markarian dbr:Hubble_Space_Telescope dbr:Paula_Szkody dbr:U_Geminorum dbr:Ursa_Major dbr:Dwarf_nova dbr:Infrared_astronomy dbr:Light_curve dbc:Emission-line_stars dbc:M-type_main-sequence_stars dbc:Objects_with_variable_star_designations dbc:Ursa_Major_(constellation) dbc:White_dwarfs dbr:SU_Ursae_Majoris dbr:Light_year dbr:Star_system dbr:Stellar_evolution dbr:Stellar_spectrum dbr:Orbital_period dbr:Stellar_parallax dbr:CNO_cycle dbr:WZ_Sagittae dbr:White_dwarf dbr:Richard_Green_(astronomer) dbc:Dwarf_novae dbr:Accretion_disk dbr:Sun dbr:Red_dwarf dbr:Margaret_Mayall dbr:Circular_polarization dbr:Circumpolar_constellation dbr:Emission_lines dbr:Orbital_inclination dbr:Stellar_magnetic_field dbr:Polar_(star) dbr:Photometric_system dbr:Wolfgang_Wenzel_(astronomer) dbr:Variable_star_designation dbr:Superhump dbr:Superoutburst dbr:Cataclysmic_variable dbr:File:BZUMaLightCurve.png dbr:Laurie_Feinswog dbr:Riccardo_U._Claudi |
| dbp:appmagV |
10.200000 (xsd:double) 15.700000 (xsd:double) (en) |
| dbp:class |
M5.5:Ve (en) |
| dbp:component |
White dwarf (en) Donor star (en) |
| dbp:constell |
dbr:Ursa_Major |
| dbp:epoch |
J2000.0 (en) |
| dbp:gravity |
7.500000 (xsd:double) |
| dbp:inclination |
~60 (en) |
| dbp:mass |
0.130000 (xsd:double) 0.650000 (xsd:double) |
| dbp:pError |
0.044100 (xsd:double) |
| dbp:parallax |
6.456100 (xsd:double) |
| dbp:propMoDec |
−15.915 (en) |
| dbp:propMoRa |
26.318000 (xsd:double) |
| dbp:radiusKm |
6880 (xsd:integer) |
| dbp:rotationalVelocity |
200 (xsd:integer) |
| dbp:temperature |
15000 (xsd:integer) |
| dbp:variable |
dbr:Dwarf_nova |
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dbt:Citation dbt:Div_col dbt:Div_col_end dbt:Reflist dbt:Short_description dbt:Starbox_astrometry dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_image dbt:Starbox_observe dbt:Starbox_orbit dbt:Starbox_reference dbt:Val dbt:DEC dbt:Odlist dbt:RA dbt:Stars_of_Ursa_Major |
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owl:Thing dbo:Place dbo:Location schema:Place dbo:CelestialBody dbo:Star |
| rdfs:comment |
BZ Большой Медведицы (лат. BZ Ursae Majoris) — карликовая новая, двойная катаклизмическая переменная звезда типа U Близнецов (UG) в созвездии Большой Медведицы на расстоянии приблизительно 497 световых лет (около 153 парсеков) от Солнца. Видимая звёздная величина звезды — от +15,3m до +10,5m. (ru) BZ Ursae Majoris is a dwarf nova star system in the northern circumpolar constellation of Ursa Major. It consists of a white dwarf primary in a close orbit with a red dwarf. The latter star is donating mass, which is accumulating in an accretion disk orbiting the white dwarf. The system is located at a distance of approximately 505 light years from the Sun based on parallax measurements. (en) |
| rdfs:label |
BZ Ursae Majoris (en) BZ Большой Медведицы (ru) |
| owl:sameAs |
wikidata:BZ Ursae Majoris dbpedia-ru:BZ Ursae Majoris https://global.dbpedia.org/id/FLoH3 |
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wikipedia-en:BZ_Ursae_Majoris?oldid=1093840817&ns=0 |
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wiki-commons:Special:FilePath/BZUMaLightCurve.png |
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wikipedia-en:BZ_Ursae_Majoris |
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wikipedia-en:BZ_Ursae_Majoris |
